I paid the IRS $10k on 4/15 as estimated payment. I filed taxes on 10/15 and owed them $822. They're not acknowledging I already paid them $10k. How do I get a refund?

I inputted into my taxes that I had already made an estimated payment of $10k.  I paid a lot of extra just to make sure I wouldn't incur any penalties.  Now the IRS is not acknowledging that I already paid them $10k.  And on top of that they're saying that I owe them interest now on the $822.